机构活动构件少，仅有三个活动构件；
The other is that the number of moving parts is few(only three).
在每个阶段内，会使用一组并行工作流定义执行的活动及每个活动使用、创建或修改的构件。
Within each phase, a set of parallel workflows define the activities performed and the artifacts that are used, created, or modified by each activity.
应用程序将自己定义为负责驱动完成协议以完成活动的构件。
The application defines itself as the artifact responsible driving the Completion protocol to complete the activity.
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